The WorldWide Telescope SDK enables custom web applications and custom data to be developed and used with Microsoft
WorldWide Telescope.

There are currently two versions of WorldWide Telescope -- the Windows
application and the Web Control. The Windows version has more features (such as
the 3-D Solar System) but cannot be customized by the use of scripts, though can
use custom data files. The Web Control can be customized with both scripts and data.